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    • 25. 发明授权
    • Defect-signal generating circuit and optical disk reproducing device having the same
    • 缺陷信号发生电路和具有该缺陷信号产生电路的光盘再现装置
    • US07339867B2
    • 2008-03-04
    • US11057339
    • 2005-02-11
    • Takeshi YamaguchiRyo Ando
    • Takeshi YamaguchiRyo Ando
    • G11B7/00
    • G11B20/10203
    • An optical disk reproducing device has a defect-signal generating circuit including a peak-holding-signal generating circuit for generating a peak-hold signal based on an RF signal read from a recording medium, an intermediate-signal generating circuit for generating an intermediate signal based on the peak-hold signal, a signal-level adjusting circuit for generating a threshold signal based on the intermediate signal, a threshold-signal adjusting circuit for adjusting the level of the threshold signal, and a comparator for generating a defect signal based on the peak-hold signal and threshold signal. The threshold-signal adjusting circuit includes at least one of: a first adjusting circuit for raising the threshold signal in the event the peak-hold signal falls below the threshold signal due to the peak-hold signal and the threshold signal being reversed; and a second adjusting circuit for lowering the threshold signal in the event the peak-hold signal exceeds the threshold signal, due to the reversal.
    • 光盘再现装置具有缺陷信号发生电路,该缺陷信号产生电路包括:峰值保持信号产生电路,用于根据从记录介质读取的RF信号产生峰值保持信号;产生中间信号的中间信号产生电路 基于所述峰值保持信号,生成基于所述中间信号的阈值信号的信号电平调整电路,用于调整所述阈值信号的电平的阈值信号调整电路,以及基于 峰值保持信号和阈值信号。 阈值信号调整电路包括以下至少一个:第一调整电路,用于在峰值保持信号由于峰值保持信号和阈值信号反相而在阈值信号下降的情况下提升阈值信号; 以及第二调整电路,用于在峰值保持信号超过阈值信号的情况下,由于反转而降低阈值信号。